Body.bodyUsed
The bodyUsed
read-only property of the
Body
mixin contains a Boolean
that indicates whether the
body has been read yet.
Syntax
var myBodyUsed = response.bodyUsed;
Value
A Boolean
.
Example
In our fetch
request example (run fetch request live), we
create a new request using the Request()
constructor,
then use it to fetch a JPG. When the fetch is successful, we read a Blob
out of the response using blob()
, put it into an object URL using
URL.createObjectURL
, and then set that URL as the source of an
<img>
element to display the image.
Notice that we log response.bodyUsed
to the console once
before the response.blob()
call and once after. This returns
false
before and true
afterwards, as at that point the body
has been read.
HTML Content
<img class="my-image" src="https://wikipedia.org/static/images/project-logos/frwiki-1.5x.png">
JS Content
var myImage = document.querySelector('.my-image');
fetch('https://upload.wikimedia.org/wikipedia/commons/7/77/Delete_key1.jpg').then(function(response) {
console.log(response.bodyUsed);
var res = response.blob();
console.log(response.bodyUsed);
return res;
}).then(function(response) {
var objectURL = URL.createObjectURL(response);
myImage.src = objectURL;
});
Specifications
Specification | Status | Comment |
---|---|---|
Fetch The definition of 'bodyUsed' in that specification. |
Living Standard |
Browser compatibility
BCD tables only load in the browser